Transparent sheet or film

ABSTRACT

The present invention is relating to a transparent sheet or film which is good in productivity, high in transparency, excellent in antistatic property and reflection preventing property, high in hardness, and excellent in scratch resistance and solvent resistance. 
     A transparent sheet or film of the present invention is a sheet or film having on one surface of a transparent support, a first electroconductive transparent layer comprising a cured layer of a resin containing fine particles of electroconductive zinc antimonate anhydride, and a second electroconductive transparent layer formed on the first layer, of which a refractive index is lower than that of the first layer.

This application is a national stage filing under 35 USC 371 fromPCT/JP99/00656, filed Feb. 16, 1999.

TECHNICAL FIELD

The present invention relates to a transparent sheet or film excellentin reflection reducing ability and having high electric conductivity andan excellent antistatic property, which is used as a surface ofpolarizing plate used in various display devices including a liquidcrystal display device, such as a word processor, a computer, atelevision set, a plasma display panel (PDP),and a surface of atransparent plastic material, sunglasses, a cover for various meters,window glass for an automobile and an electric train, and the like.

BACKGROUND ART

A transparent substrate, such as glass and plastics, is used as a cornermirror, a rear-view mirror, goggle, window glass, a personal computer, aword processor, a PDP, an LCD (liquid crystal display), variouscommercial designs, and the like. When we observe the objects such asletters and graphics through the transparent substrate, there is aproblem that we cannot notice the substances clearly because ofreflection on the surface of the transparent subjects. As a method forpreventing the light reflection on the transparent substrate, there is aconventional method, in which a about 0.1 μm thick thin film of MgF₂,SiO₂ and the like is formed on the surface of glass or plastics by a gasphase method, such as a plasma CVD (chemical vapor deposition) methodand the like. In order to impart the antistatic property, it isnecessary that a metallic film having high transparency, such as ITO,ATO and the like, is formed in the similar manner.

However, the method of forming the about 0.1 μm thick thin film of MgF₂,SiO₂ and the like on the transparent substrate, such as surface ofglass, a plastic substrate and the like has disadvantages that acomplicated process and a large-scale apparatus are required, and theproductivity is poor to increase the cost thereof.

The object of the invention is to provide an inexpensive transparentsheet or film having an antistatic property and a reflection reductionproperty having good productivity.

DISCLOSURE OF THE INVENTION

The invention relates to:

(1) A transparent sheet or film having on one surface of a transparentsupport, a first electroconductive transparent layer comprising a curedlayer of a resin containing fine particles of electroconductive zincantimonate anhydride, and a second electroconductive transparent layerformed on the first layer, of which a refractive index is lower thanthat of the first layer;

(2) A transparent sheet or film as described in item (1), wherein thefirst electroconductive transparent layer contains a dispersant;

(3) A transparent sheet or film as described in item (1) or (2), whereinthe above mentioned fine particles are zinc antimonate anhydride havinga primary particle diameter of 0.5 micron or less, and the resin is anultraviolet ray-curable (meth)acrylate having two or more (meth)acryloylgroups in a molecule thereof;

(4) A transparent sheet or film as described in item (1) or (2), whereinthe above mentioned fine particles are zinc antimonate having a particlediameter, by a BET method, of 18 nm or less and an average particlediameter, by a dynamic light scattering method, of 100 nm or less, andof which resin comprises an ultraviolet ray-curable (meth)acrylatehaving two or more (meth)acryloyl groups in a molecule thereof;

(5) A transparent sheet or film as described in any one of items (1) to(4), wherein a content ratio of the electroconductive zinc antimonateanhydride is from 50 to 90% by weight;

(6) A transparent sheet or film as described in any one of items (1) to(5), wherein the first electroconductive transparent layer has arefractive index (25° C.) of 1.55 or higher;

(7) A transparent sheet or film as described in any one of items (1) to(6), wherein the second layer has a refractive index of 1.48 or less;

(8) A transparent sheet or film as described in any one of items (1) to(7), wherein the second layer contains a surface active agent;

(9) A transparent sheet or film as described in any one of items (1) to(8), wherein the second has a thickness of 1 μm or less;

(10) A transparent sheet or film as described in any one of items (1) to(9), which has a hard coated layer comprising an ultraviolet ray-curable(meth) acrylate resin having two or more (meth)acryloyl groups in amolecule thereof, between the transparent support and the first layer;

(11) A transparent sheet or film as described in any one of items (1) to(10), which has a transparent layer comprising an ultravioletray-curable transparent hard coating agent and having a refractive indexhigher than that of the first layer between the first layer and thesecond layer;

(12) A transparent sheet or film as described in item (11), wherein theultraviolet ray-curable transparent hard coating agent of a highrefractive index comprises an ultraviolet ray-curable binder containingan ultraviolet ray-curable resin having two or more (meth)acryloylgroups in a molecule thereof, and fine particles of a high refractiveindex comprising a metal or a metallic oxide; and the transparent layercomprising the transparent hard coating agent has a refractive index of1.55 or higher;

(13) A transparent sheet or film as described in item (11), wherein thefine particles of a high refractive index are zirconium oxide, titaniumoxide, cerium oxide, zinc oxide, indium oxide or a three-component solof titanium oxide, zirconium oxide and tin oxide, and have an averageparticle diameter of 0.5 μm or less;

(14) A transparent sheet or film as described in any one of items (10)to (13), characterized that the transparent sheet or film has fineunevenness on the surface , facing the first layer, of the hard coatedlayer formed between the transparent support and the first layer, andthe hard coated layer being made from the ultraviolet ray-curable(meth)acrylate resin, or on the surface, facing the second layer, of thetransparent layer having high refractive index of the ultravioletray-curable transparent hard coat agent;

(15) A transparent sheet or film as described in any one of items (1) to(14), which has an adhesive agent layer on the other surface of thetransparent support;

(16) A transparent sheet or film as described in item (15), wherein theadhesive agent is colored by a coloring agent;

(17) A transparent sheet or film as described in item (16), wherein thecoloring agent is a pigment;

(18) A transparent sheet or film which comprises having, on one surfaceof the transparent support, a hard coating layer of an ultravioletray-curable (meth)acrylate resin having two or more (meth)acryloylgroups in a molecule thereof, and a first electroconductive transparentlayer which comprises a cured layer of a resin containing fine particlesof electroconductive zinc antimonate anhydride being formed thereon, anda second electroconductive transparent layer being formed on the firstelectroconductive transparent layer of which refractive index is lowerthan that of the first layer, wherein the fine particles of zincantimonate are zinc antimonate having a particle diameter, by a BETmethod, of 18 nm or less and an average particle diameter, by a dynamiclight scattering method, of 100 nm or less and wherein said resin of thesecond layer comprises an ultraviolet ray-curable (meth)acrylate havingtwo or more (meth)acryloyl groups in a molecule thereof and a contentratio of the electroconductive zinc antimonate anhydride is from 50 to90% by weight and of which haze is 1.5 or less and a reflectivity is 2%or less;

(19) A display device on which a transparent sheet or film as describedin any one of items (1) to (18) is attached;

(20) An electroconductive transparent hard coat agent comprising a solof electroconductive zinc antimonate anhydride having a particlediameter, by a BET method, of 18 nm or less and an average particlediameter, by a dynamic light scattering method, of 100 nm or less, and adispersant;

(21) An electroconductive transparent hard coating agent as described initem (20), which contains an ultraviolet ray-curable resin; and

(22) An electroconductive transparent hard coating agent as described initem (20) or (21), wherein a content ratio of the electroconductive zincantimonate anhydride is from 50 to 90% by weight of a non-volatilecomponent.

BEST MODE FOR CARRYING OUT THE INVENTION

The transparent sheet or film of the invention has, on one surface of atransparent support, a first electroconductive transparent layercomprising a cured film of a resin containing fine particles ofelectroconductive zinc antimonate anhydride and a second transparentlayer formed thereon having a refractive index lower than that of thefirst layer. The surface reflectivity (reflectivity at 550 nm) isdesirably 4% or less, and preferably 2% or less. The numerical values ofthe reflectivity herein are not so strict but are rough standard. Thetransparent sheet or film of the invention preferably has a totalluminous transmittance of 80% or more under the condition where anadhesive agent layer is not present. The total luminous transmittanceherein is a value measured by a method defined in JIS K7105 (1981).

The support used in the invention is not particularly limited as far asit is in the form of a transparent sheet or film, and examples thereofinclude those made of glass and those made of plastics. Examples of theplastics include polyethylene, polyethylene terephthalate,polypropylene, polystyrene, an acrylic resin and the like.

The terms sheet or film in the invention are not for strictlydistinguishing a sheet and a film, but is used for clarifying that itencompasses both of them. The sheet or film can be interpreted widely tothe fullest extent as far as it has the characteristic features of theinvention, and the sheet encompasses those called a plate or a board asfar as they have the characteristic features of the invention. In thecase where the sheet and the film are distinguished as in the Examplesand the like, the sheet is generally used for those having a thicknessof about from 0.5 to 5 mm, and the film is generally used for thosehaving a thickness of from 10 to 500 μm. The transparent support mayhave a hard coating layer comprising an ultraviolet ray-curable(meth)acrylate resin having two or more (meth)acryloyl groups in amolecule thereof. The thickness of the hard coating layer is determinedby the surface hardness required in the resulting transparent sheet orfilm, and is preferably from 3 to 20 μm. Examples of the ultravioletray-curable (meth)acrylate resin having two or more (meth)acryloylgroups in a molecule thereof include the ultraviolet ray-curable(meth)acrylate resins having two or more (meth)acryloyl groups in amolecule thereof used in the first layer described later.

The content of the fine particles of electroconductive zinc antimonateanhydride in the first electroconductive transparent layer is generally30% by weight or more, and preferably 40% by weight or more, based onthe total weight of the first layer, and in the case where higherelectroconductivity is demanded, it may be 50% by weight or more, or 55%by weight or more. The upper limit is not particularly limited as far asthe first layer can be formed with the resin contained, and is generally90% by weight or less. There are cases where it is preferably 80% byweight or less, and further preferably 70% by weight or less, from thestandpoint of the strength and the transparency of the first layer. Thethickness of the first layer is generally about from 0.5 to 6 μm, andpreferably about from 1 to 4 μm. The first electroconductive transparentlayer is formed by coating, on one surface of the transparent support,an electroconductive coating agent (A) comprising fine particles ofelectroconductive zinc antimonate anhydride and a resin, followed bycuring. In some cases, the electroconductive coating agent (A) may becoated on one surface of the transparent support through another layer.Particularly, in order to obtain the first layer of high refractiveindex, for example, a refractive index of 1.55 or more (25° C.,hereinafter the same), the content of the fine particles ofelectroconductive zinc antimonate anhydride in the firstelectroconductive transparent layer is suitably from 50 to 90% byweight, and preferably from 55 to 90% by weight.

The zinc antimonate anhydride used in the invention is suitably thosehaving a primary particle diameter of 0.5 μm or less. The process forproducing the zinc antimonate anhydride is described, for example, inJP-A-6-219743, and the zinc salt can be available as an organosol ofmethanol (Celnax CX-Z600M-3, produced by Nissan Chemical Industries,Ltd.) or methanol/isopropanol (Celnax CX-Z300IM, Celnax CX-Z650M-3F andCelnax CX-Z600M-3F2, all produced by Nissan Chemical Industries, Ltd.).The zinc antimonate anhydride sols are said to have a primary particleof 0.5 μm or less, but preferably coarse particles are removed bypassing a filter having an absolute pore diameter of 0.6 μm or less, soas to obtain a film of higher transparency in comparison to the case ofthat before passing the filter. The zinc antimonate sol is preferably afirst-particle diameter, by a BET method, of 18 nm or less and anaverage particle diameter, by a dynamic light scattering method, of 100nm or less. The zinc antimonate anhydride has a volume resistivity, forexample, of from 1×10² to 1×10³, but is not limited thereto. Theparticle diameter by a BET method is a particle diameter calculated by agas phase adsorption method of the zinc antimonate in a powder form. Theaverage particle diameter by a dynamic light scattering method is anaverage particle diameter obtained by measuring in the state of a zincantimonate sol by an N4 apparatus produced by Coulter Inc. The contentof the zinc antimonate is preferably from 50 to 90% by weight in thenon-volatile component (components other than a solvent) of the hardcoat agent (A).

While the sol of zinc antimonate anhydride is stable in methanol not toincrease the particle diameter thereof by aggregation, in the case whereit is used by mixing with an ultraviolet ray-curable resin or a solvent,such as toluene, MEK (methyl ethyl ketone), ethyl acetate and the like,it becomes unstable, whereby it increases the particle diameter thereofby aggregation, and the dispersion thereof is broken to occur separationand precipitation. In order to stably disperse the sol of zincantimonate anhydride in the resin or the solvent, it is preferred todisperse it by using a dispersant. As the dispersant, a cationicdispersant, a weakly cationic dispersant, a nonionic dispersant and anamphoteric dispersant are effective. In particular, a surface activeagent of an alkylamine series modified by a lower (C2 to C3)alkyleneoxide, such as propylene oxide, ethylene oxide and the like,e.g., Solsperse 20000 (a trade name, an PO, EO modified product ofalkylamine, produced by Zeneca Agrochemicals, Co., Ltd.) and TAMNO-15 (atrade name, an EO modified product of alkylamine, produced by NikkoChemicals Co., Ltd.), can be exemplified as preferred examples. Theaddition amount thereof is generally from 0.05 to 20% by weight, andpreferably from 0.5 to 20% by weight, against the zinc antimonateanhydride. Examples of the alkyl group (which may have a double bond) ofthe alkylamine include an alkyl group having from 1 to 20 carbon atoms,such as a methyl group, an ethyl group, a lauryl group, a stearyl group,an oleyl group and the like. The addition mole number of EO (ethyleneoxide) and /or PO (propylene oxide) is about from several mol to 100 molper 1 mol of the amine, but is not limited thereto. In addition to thecomponents described in the foregoing, a leveling agent and a defoamingagent may be added depending on necessity.

The resin in the first layer of the invention behaves as a binder, andfor example, a thermosetting resin, an ultraviolet ray-curable resin andthe like may be used as the resin. Taking the production efficiency, thecost and the scratch resistance into consideration, an ultravioletray-curable resin is more preferred. As the ultraviolet ray-curableresin herein, an ultraviolet ray-curable (meth)acrylate (used as meaningof acrylate and/or methacrylate, the similar expressions hereinafterhaving the similar meanings) is preferred, and examples thereof includean ultraviolet ray-curable polyfunctional acrylate having two or more(meth) acryloyl group in a molecule thereof. Examples of the ultravioletray-curable polyfunctional acrylate having two or more (meth) acryloylgroup in a molecule thereof include a polyolpoly(meth)acrylate, such asneopentyl glycol di(meth)acrylate, 1,6-hexanediol di(meth)acrylate,trimethylolpropane tri(meth)acrylate, ditrimethylolpropanetetra(meth)acrylate, pentaerythritol tetra(meth)acrylate,pentaerythritol tri(meth)acrylate, dipentaerythritol hexa(meth)acrylateand the like, an epoxy (meth)acrylate, such as di(meth)acrylate ofbisphenol A diglycidyl ether, di(meth)acrylate of neopentyl glycoldiglycidyl ether, di(meth)acrylate of 1,6-hexanediol diglycidyl etherand the like, a polyester (meth)acrylate obtained by esterification of apolyvalent carboxylic acid and/or an anhydride thereof, and acrylic acidwith a polyvalent alcohol, , a urethane acrylate obtained by reaction ofa polyvalent alcohol, a polyvalent isocyanate and an acrylate containinga hydroxyl group, polysiloxane acrylate, and the like. The polymerizableacrylates may be used singly or as a mixture of two or more of them.

While the refractive index of the first layer is not particularlylimited, since a film having a higher refractive index than the secondlayer is used, the refractive index is preferably higher than 1.5, andmore preferably 1.55 or more.

The electroconductive coating agent (A) for forming the film of thefirst layer can be generally obtained by adding, depending on necessity,a dispersant, a resin solution or a polymerizable resin solution (whichterm is used as a meaning containing a polymerizable monomer liquid), apolymerization initiator, and a diluting agent, such as an organicsolvent, for example, a lower alcohol, a lower alkyl ketone (forexample, methyl ethyl ketone and the like), a lower organic acid ester(for example, ethyl acetate and the like), a benzene series solvent(toluene, xylene and the like) and the like, to an electroconductivesubstance dispersion formed by uniformly dispersing theelectroconductive zinc antimonate anhydride in a solvent, such as water,a lower alcohol (for example, methanol, ethanol and the like), and thelike, followed by sufficiently mixing.

While the composition of the electroconductive coating agent (A) is notparticularly limited, the content of the electroconductive zincantimonate anhydride is generally 30% by weight or more, preferably 40%by weight or more, more preferably 50% by weight or more, and furtherpreferably 55% by weight or more, against the weight of the total solidcontent in the dispersion (the weight of the total components exept thesolvent), and the upper limit thereof is generally 95% or less byweight, preferably 90% or less by weight, more preferably 80% or less byweight, and further preferably 70% or less by weight. The optimum rangeis about from 50 to 65% by weight. The content of the resin component(which term is used as a meaning containing a polymerizable resincomponent) is the reminder obtained by subtracting the content of theelectroconductive substance from the total weight of the solid contentin the dispersion. When the content of the zinc antimonate anhydride is30% by weight, it is 70% by weight at most, and when the auxiliaries,such as the dispersant, the polymerization initiator and the like, arecontained, it is the reminder obtained by further subtracting them. Inthe case where a dispersant is used, the content thereof is generallyabout from 0.5 to 15% by weight, preferably about from 1 to 10% byweight, and more preferably about from 2 to 6% by weight, against thetotal weight of the solid content in the dispersion. The polymerizationinitiator is generally about from 1 to 15% by weight, and preferablyabout from 2 to 10% by weight, against the total weight of the solidcontent in the dispersion. While the ratio of the solid content and thesolvent can be determined by the factors of easiness of forming the filmand the like, the solid content is generally about from 40 to 90% byweight, and preferably about from 50 to 80% by weight, against the totalweight of the dispersion, and the balance is the solvent.

In the case where an ultraviolet ray-curable resin is used as the binderof the electroconductive coating agent (A) for the first layer, anultraviolet ray-curable coating agent (B) obtained by mixing the othercomponents is gradually added under stirring into a zinc antimonate solto produce the objective resin composition for the first layer.Furthermore, it is possible that the dispersant is firstly added to azinc antimonate sol, and then the ultraviolet ray-curable coating agent(B) containing the other components is added, so as to produce thecomposition.

The transparent second layer having a low refractive index is generallyaccumulated on the first layer through another layer depending onnecessity. In order to reduce reflection, it is necessary that thesecond layer has a refractive index lower than the refractive index ofthe first layer. While the refractive index of the second layer is notparticularly limited as far as it is lower than the refractive index ofthe first layer, it is generally 1.5 or less, and preferably about 1.48or less. The lower limit of the refractive index is not particularlylimited, and is generally about 1.28. The thickness thereof ispreferably 1 μm or less, and particularly about 0.1 μm.

As the material for the second layer, while the thermosetting resin, theultraviolet ray-curable resin and the like can be used as similar to thecase of the first layer, resins having lower refractive indexes than theresin of the first layer are used, and a resin having a low refractiveindex (hereinafter referred to as a low refractive index resin) ispreferred. For example, those providing a refractive index of a film ofless than 1.5 can be exemplified, and more preferably those of aboutless than 1.48 can be exemplified. Examples of the resin having a lowrefractive index include an ultraviolet ray-curable resin, athermosetting polysiloxane resin (such as KP-854 and KP 85 produced byShin-Etsu Chemical Co., Ltd.) and a thermosetting fluorine-containingpolysiloxane resin disclosed in JP-A-9-208898.

The thermosetting fluorine-containing polysiloxane resin disclosed inJP-A-9-208898 is generally obtained as a solution and is cured by heatat from 80 to 450° C.

The ultraviolet ray-curable resin having a low refractive index is usedas a mixed resin of a general ultraviolet ray-curable resin and anultraviolet ray-curable resin having a low refractive index, a monomercontaining fluorine or a low refractive index thermoplastic polymer, oris used singly as the ultraviolet ray-curable resin having a lowrefractive index. In the case of the mixed resin, the ratio of thegeneral ultraviolet ray-curable resin and the ultraviolet ray-curableresin having a low refractive index, the monomer containing fluorine orthe low refractive index thermoplastic polymer is determined byconsidering the reflection preventing property, the scratchingresistance, the solvent resistance and the like of the surface of thelayer.

As the ultraviolet ray-curable resin having a low refractive index, alow refractive index acrylate, such as trifluoroacrylate (refractiveindex: 1.32) is preferably used. Furthermore, an ultraviolet ray-curablesilicone series resin, such as X-12-2400 (a trade name, an ultravioletray-curable silicone series resin produced by Shin-Etsu Chemical Co.,Ltd.), is preferred. Examples of the monomer containing fluorine includeCF₂═CF₂, CH₂═CF₂, CF₂═CHF and the like, and as the low refractive indexthermoplastic polymer, a fluorine series polymer containing a fluorineatom is preferred since it has a low refractive index of 1.45 or less.Furthermore, those obtained by polymerizing the monomer containingfluorine and those obtained by making them into a block polymer can alsobe used. Specific examples of the polymer, the main chain of which hasbeen subjected to fluorine modification, include PTFE(polytetrafluoroethylene), PVDF (polyvinylidene fluoride), PVF(polyvinyl fluoride) and the like.

The general ultraviolet ray-curable resin (generally providing arefractive index of a film of more than 1.5) used in combination withthe resin having a low refractive index is mainly used for increasingthe strength of the film, such as the scratch resistance, the solventresistance and the like, and for example, a polyfunctional acrylatehaving two or more of unsaturated groups is preferred. While theaddition amount of the polyfunctional acrylate is preferably small fromthe standpoint of the refractive index, it is preferably added, in orderto improve the scratch resistance, in 5 parts or more, and morepreferably 10 parts or more, per 100 parts by weight of the ultravioletray-curable resin having a low refractive index, and the upper limitthereof is generally about 60 parts by weight or less, and preferablyabout 40 parts or less, while depending on the species of the resinadded.

Examples of the polyfunctional acrylate used in combination forimproving the strength of the second layer include a polyolpoly(meth)acrylate, such as neopentyl glycol di(meth)acrylate,1,6-hexanediol di(meth)acrylate, trimethylolpropane tri(meth)acrylate,ditrimethylolpropane tetra(meth)acrylate, pentaerythritoltetra(meth)acrylate, pentaerythritol tri(meth)acrylate,dipentaerythritol hexa(meth)acrylate and the like, an epoxy(meth)acrylate, such as di(meth)acrylate of bisphenol A glycidyl ether,di(meth)acrylate of neopentyl glycol diglycidyl ether, di(meth)acrylateof 1,6-hexanediol diglycidyl ether and the like, a polyester(meth)acrylate obtained by esterification of a polyvalent carboxylicacid and/or an anhydride thereof, and acrylic acid with a polyvalentalcohol, , a urethane (meth)acrylate obtained by reaction of apolyvalent alcohol, a polyvalent isocyanate and an acrylate containing ahydroxyl group, polysiloxane (meth)acrylate, and the like.

In order to reduce the refractive index of the second layer, it isgenerally preferred to use ultrafine particles having a low refractiveindex. In the case where the ultrafine particles are used incombination, the content of the ultrafine particles in the second layeris generally about from 100 to 400 parts by weight, and preferably from100 to 300, per 100 parts by weight of the resin (the total amount ofthe resin in the second layer). In the case where the generalultraviolet ray-curable resin is used in combination for improving thehardness, it is generally preferred to use the ultrafine particleshaving a low refractive index. The ultrafine particles are generallyfine particles having a particle diameter of from 5 to 50 nm and arefractive index of 1.5 or less, preferably 1.45 or less. As the lowrefractive index fine particles, for example, ultrafine particles of LiF(refractive index: 1.4), MgF₂ (refractive index: 1.4), 3NaF.AlF₃(refractive index: 1.4), AlF₃ (refractive index: 1.4), Na₃AlF₆(cryolite, refractive index: 1.33), SiO_(x) (silica sol, 1.50 <×<2.0)(refractive index: 1.35 to 1.48) and the like are used, and silica solis preferred.

In order to prevent stain on the surface, it is preferred to add asurface active agent (dispersant) having a stain preventing property tothe second layer having a low refractive index. Examples of the surfaceactive agent having a contamination preventing property include asilicone types surface active agent, a fluorine types surface activeagent and the like. The addition amount thereof is about 0 to 10% byweight based on the total amount of the resin.

In the forming method of the second layer having a low refractive index,for example, a low refractive index coating agent for the second layercontaining the resin having a low refractive index mentioned above, anddepending on necessity, a resin for increasing the strength, apolymerization initiator, ultrafine particles having a low refractiveindex and so on, is diluted depending on necessity, and generally iscoated directly on the first layer, or in the case where another layerintervenes, is coated on that layer, followed by heating in the case ofthe thermosetting resin, or followed by irradiating with an ultravioletray in the case of the ultraviolet ray-curable resin, so as to cure thecoated film. The low refractive index coating agent can be obtained bydispersing or dissolving the respective components described in theforegoing in the proportions described in the foregoing depending onnecessity in a suitable solvent. The content ratio of the solvent andthe solid components except the solvent is not particularly limited asfar as it is such a concentration that the coating agent can be coated,and in general, the content ratio of the solid components is about from0.5 to 50% by weight, and preferably about from 0.5 to 20% by weight,based on the total weight of the coating agent.

The thickness of the second layer is preferably 2 μm or less, and morepreferably 1 μm or less, and when it is formed as a thin film of about0.1 μm, it is advantageous in the effect of reflection prevention.

In order to further improve the reflection prevention performance, ahigh refractive index layer having a refractive index higher than therefractive index of the first layer is preferably formed between thefirst layer and the second layer. The refractive index of the highrefractive index layer is preferably 1.55 or more, more preferably 1.6or more, and further preferably 1.65 or more. The upper limit is notparticularly limited, and is about 2.7 by the current technology. Thethickness of the high refractive index layer is determined by thesurface hardness and the electric conductivity demanded and is, forexample, preferably about from 0.1 to 2 μm.

The high refractive index layer is obtained by coating a transparenthard coat agent for a high refractive index on the first layer, followedby curing. The ultraviolet ray-curable transparent hard coat agent for ahigh refractive index contains, for example, high refractive index fineparticles, such as a metal or a metal oxide, and a binder resin as asolid content. The ratio of the high refractive index metallic oxide andthe binder resin is preferably high in proportion of the high refractiveindex metallic oxide, and from the standpoint of the film property ofthe composition and the scratch resistance of the film, the ratio ofhigh refractive index metal oxide/binder is preferably from 80/20 to50/50 (weight ratio).

Examples of the fine particles having a high refractive index includeZnO (refractive index: 1.90), TiO₂ (refractive index: 2.3 to 2.7), CeO₂(refractive index: 1.95), Sb₂O₅ (refractive index: 1.7), ITO (refractiveindex: 1.95), Y₂O₃ (refractive index: 1.87), La₂O₃ (refractive index:1.95), ZnO₂ (refractive index: 2.05), Al₂O₃ (refractive index: 1.63) andthe like, and zirconium oxide, titanium oxide, cerium oxide, zinc oxide,indium oxide and a three-component sol of titanium oxide, zirconiumoxide and tin oxide are preferred. In order that the film hastransparency, the particle diameter of the high refractive indexmetallic oxide is generally 0.5 μm or less, and preferably 0.1 μm orless.

As the binder resin for the high refractive index layer, for example, athermosetting resin or an ultraviolet ray-curable resin containing amolecule or an atom contributing to improvement of the refractive indexand having a high refractive index is used alone or in combination.However, in order to improve the hardness of the high refractive indexresin, an ultraviolet ray-curable resin is preferred. Examples of themolecule or the atom contributing to improvement of the refractive indexinclude an aromatic ring, a halogen atom except F, and an atom of S, N,P and the like.

Examples of the ultraviolet ray-curable resin binder for the higherrefractive index layer include an ultraviolet ray-curable polyfunctionalacrylate having two or more (meth)acryloyl groups in the moleculethereof. Examples of the ultraviolet ray-curable polyfunctional acrylatehaving two or more (meth)acryloyl groups in the molecule thereof includea polyol polyacrylate, such as neoppentyl glycol di(meth)acrylate,1,6-hexanediol di(meth)acrylate, trimethylolpropane tri(meth)acrylate,ditrimethylolpropane tetra(meth)acrylate, pentaerythritoltetra(meth)acrylate, pentaerythritol tri(meth)acrylate,dipentaerythritol hexa(meth)acrylate and the like, an epoxy(meth)acrylate, such as diacrylate of bisphenol A glycidyl ether,diacrylate of neopentyl glycol diglycidyl ether, di(meth)acrylate of1,6-hexanediol diglycidyl ether and the like, a polyester (meth)acrylateobtained by esterification of a polyvalent carboxylic acid and/or ananhydride thereof, and acrylic acid with a polyvalent alcohol, aurethane acrylate obtained by reaction of a polyvalent alcohol, apolyvalent isocyanate and an acrylate containing a hydroxyl group,polysiloxane acrylate, and the like. The polymerizable acrylatesmentioned above may be used singly or as a mixture of two or more ofthem.

The transparent hard coating agent for a high refractive index used inthe invention may contain a high refractive index thermoplastic polymer.Examples of the high refractive index thermoplastic polymer include apolyester resin, an epoxy resin, an acrylic resin, a urethane resin andthe like other than described in the foregoing.

In the invention, in order to impart an antiglare property to theresulting transparent sheet or film, fine unevenness may be made on thesurface, facing the first layer, of the hard coating layer of theultraviolet ray-curable (meth)acrylate resin made between thetransparent support and the first layer or may be made on the surfacefacing the second layer of the transparent cured film layer of theultraviolet ray-curable transparent hard coating agent of a highrefractive index. In order to provide the fine unevenness, organic orinorganic fine particles (average particle diameter: 0.5 to 20 μm, by alight scattering method), such as silica, acrylic beads, silicone beads,benzoguanamine, urethane beads and the like, may be added to the hardcoat layer or the transparent cured film layer in an amount of from 5 to30% by weight against the resin component.

The transparent hard coating agent for a high refractive index used inthe invention can be obtained by dispersing or dissolving a binder resinfor the high refractive index layer, high refractive index fineparticles, depending on necessity a polymerization initiator, anauxiliary, such as antiglare agent, other resins and the like in asuitable solvent. The ratio of the solvent and the solid componentsexcept the solvent is not limited as far as it is such a concentrationthat the coating agent can be coated, and in general, the proportion ofthe solid components is about from 10 to 95% by weight, and preferablyabout from 30 to 50% by weight, based on the total weight of the coatingagent, and the balance is controlled by the solvent.

In order to improve the adhesion strength, a polymer may further beadded to the coating agents for the respective layers. Examples of thepolymer include an acrylic resin, a polyester resin, a butyral resin andthe like other than those described in the foregoing. The adhesionstrength herein means the adhesion strength to the support with respectto the electroconductive coating agent for the first layer, and theadhesion strength to the electroconductive resin layer of the firstlayer and the low refractive index coating layer of the second layerwith respect to the high refractive index transparent hard coat agentfor the high refractive index layer.

A photopolymerization initiator is generally added to theelectroconductive coating agent, the transparent hard coat agent for ahigh refractive index and the low refractive index ultravioletray-curable coating agent. The photopolymerization initiator is notparticularly limited, and various photopolymerization initiators can beused. Examples thereof include Irgacure 184 or Irgacure 651 (produced byCiba Geigy Ltd.), Darocure 1173 (produced by Merck & Co.), benzophenone,methyl benzoylbenzoate, p-dimethylamino benzoate, thioxanthone and thelike. The content thereof is preferably from 1 to 20% by weight based onthe solid content of the composition.

An organic solvent may be additionally added to the respective coatingagents. Examples of the organic solvent include an aromatic hydrocarbon,such as toluene, xylene and the like, a ketone, such as methyl ethylketone and the like, an ester, such as ethyl acetate and the like, analcohol, such as methanol, ethanol and the like, and so on.

In order to produce the transparent sheet or film of the invention, forexample, an electroconductive resin composition is coated on a supportfilm by a coater, such as a gravure coater, a reverse coater, amicroreverse coater and the like, and after drying, it is cured byirradiating with an ultraviolet ray, so as to form a cured film. Thesecond layer can be formed on the first layer in the similar manner. Inthe case where a high refractive index hard coat layer is made, thehigher refractive index hard coat layer is made on the first layer inthe similar manner, and the second layer is formed on the higherrefractive index hard coat layer. An ordinary hard coat layer may bemade between the support and the first layer to further increase thesurface hardness. In order to impart an antiglare property to the hardcoat layer, organic or inorganic fine particles, such as silica, acrylicbeads, silicone beads, benzoguanamine, urethane beads and the like, maybe added to form fine unevenness on the surface thereof.

In the case of coating the coating agent, the coating agent may be usedafter appropriate dilution.

The transparent sheet or film of the invention is arranged on a displaysurface of a display device, such as LCD, CRT (cathode ray tube), a PDPand the like, or used in an electronic-related materials, such as astorage container of a semiconductor wafer, a construction member, suchas a floor material, carpet, a wall material and the like, and so on. Inthis case, an adhesive agent layer, preferably a pressure-sensitiveadhesive agent layer, is generally made on a back surface (the surfaceopposite to the surface, on which the first layer and the second layerare made) of the antistatic reflection preventing transparent sheet orfilm of the invention, and it is attached on the surface of a displaydevice and the surface of the others through the adhesive agent layer.The adhesive agent used herein is preferably an acrylic ester adhesiveagent. The adhesive agent may be colored, if necessary. From thestandpoint of durability, the coloring is conducted with a pigmentrather than a dye. While the pigment may be an inorganic pigment or anorganic pigment, it is preferably in the form of fine particles and thehaze of the adhesive agent colored with the pigment is preferably 3.0 orless from the standpoint of maintenance of the transparency. This isbecause sharpness of an picture can be maintained when the film isapplied to a CRT. The reason why the coloring is conducted with apigment is that while adjustment of brightness and adjustment of colortone are conducted by coloring glass in a CRT and a PDP, the control ofbrightness and the control of color tone can be conveniently conductedby coloring the adhesive agent, so as to reduce the cost. The additionamount of the pigment varies depending on the required transmittance andcolor tone.

EXAMPLES

The invention will be specifically described with reference to theProduction Examples of Coating Agents and Examples. The parts show partsby weight unless otherwise indicated.

PRODUCTION EXAMPLES OF COATING AGENTS

(1) Production of Electroconductive Coating Agent for First Layer

(1-1) 3.5 Parts of Solsperse 20000 (a trade name, produced by ZenecaAgrochemicals, Co., Ltd., a cationic dispersant) as a dispersant isadded to 100 parts of a methanol sol of zinc antimonate (a trade name,Celnax CX-Z600M-3, solid content: 60%, produced by Nissan ChemicalIndustries, Ltd.) under stirring, and 50 parts of an ultravioletray-curable resin composition (A), which is formed by mixing 64 parts ofdipentaerythritol hexaacrylate (a trade name, KAYARAD DPHA, produced byNippon Kayaku Co., Ltd.), 5.5 parts of a photoinitiator, Irgacure 184(produced by Ciba Geigy Ltd.) and 30 parts of toluene, is further added,followed by further adding 35 parts of MEK as a diluting solvent and0.02 part of silicone series slipping agent SF-8421 (a trade name,produced by Toray Dow Corning Silicone Co., Ltd.), so as to obtain anultraviolet ray-curable electroconductive coating agent (11).

(1-2) 2 Parts of Solsperse 20000 (a dispersant, produced by ZenecaAgrochemicals, Co., Ltd.) and 32 parts of MEK are added to 100 parts ofCelnax CX-Z600M-3F2 (a methanol sol of zinc antimonate, solid content:60%, produced by Nissan Chemical Industries, Ltd.) under stirring, and25 parts of the ultraviolet ray-curable resin composition (A) is furtheradded thereto as a binder, followed by sufficiently stirring, so as toobtain an electroconductive high refractive index hard coat agent (12).

(2) Production of Hard Coating Agent for High Refractive Index Layer

(1) 3 Part of Solsperse 20000 (a trade name) as a dispersant and 0.5part of Irgacure 369 (a trade name) are added to 100 parts of a methanolsol of three components, TiO₂-SnO₂-ZrO₂ (solid content: 30%) (a tradename, HIT-30M, produced by Nissan Chemical Industries, Ltd.) understirring, and 14.3 parts of an ultraviolet ray-curable resin (B), whichis formed by mixing 63.6 parts of DPHA (produced by Nippon Kayaku Co.,Ltd.) as an ultraviolet ray-curable resin having six acrylate groups,photoinitiators, 6.4 parts-of Irgacure 184 (a trade name) and 1.8 partsof Irgacure 369 (a trade name), and 30 parts of toluene, is furtheradded, followed by sufficiently stirring, so as to obtain an ultravioletray-curable high refractive index hard coating agent (1).

(2) An ultraviolet ray-curable high refractive index hard coat agent (2)is obtained in the same manner as (1) except that the addition amount ofthe ultraviolet ray-curable resin (B) is 28.6 parts.

(3) Production of Low Refractive Index Coating Agent for Second Layer

(a) 100 Parts of a silicone series ultraviolet ray-curable resin(produced by Shin-Etsu Chemical Co., Ltd.) and 3 parts of aphotoinitiator, Irgacure 184 (a trade name) are added to 300 parts of anMEK solution of silica sol having an average particle diameter of 30 nm(solid content: 30%) (produced by Nissan Chemical Industries, Ltd.)under stirring, so as to obtain a low refractive index ultravioletray-curable resin composition (a).

(b) 100 Parts of the ultraviolet ray-curable resin (A), 133 parts ofmethyl ethyl ketone and 233 parts of MEK-ST (a trade name, an MEKsolution of silica sol, solid content: 30%, produced by Nissan ChemicalIndustries, Co., Ltd.) are mixed and sufficiently stirred to obtain anultraviolet ray-curable resin (C). Furthermore, 80 parts of theultraviolet ray-curable resin composition (a) and 20 parts of theultraviolet ray-curable resin (C) are mixed and sufficiently stirred toobtain a low refractive index ultraviolet ray-curable resin composition(b).

(4) Production of Ultraviolet Ray-Curable Hard Coating Agent usedbetween Support and First Layer

30 Parts of Vylon 24SS (a polymer solution of a solid content of 30%,Toyobo Co., Ltd.), 5.5 parts of Irgacure 184 (a photoinitiator, producedby Ciba Geigy Ltd.) and 34 parts of toluene are added to 64 parts ofKAYARAD DPHA (dipentaerythritol hexaacrylate produced by Nippon KayakuCo., Ltd.) to obtain an ultraviolet ray-curable hard coating agent (41).

Examples 1 to 9

The ultraviolet ray-curable electroconductive coating agent (1) iscoated on a polyester film of 188 microns (A4300 produced by Toyobo Co.,Ltd.) to a film thickness of 3 μm to provide the first layer. The highrefractive index hard coat agent (1) or (2) is coated on the first layerto obtain a high refractive index hard coated film. A dispersionobtained diluting the low refractive index resin composition (a) or (b)with methyl ethyl ketone to the concentrations shown in Table 1 below isfurther coated thereon to provide the second layer, so as to obtain anelectroconductive low reflection film. In Table 1, the hard coat layeris made between the support and the first layer. The expressions (1) and(2) in the column of “high refractive index layer” in Table 1 show thehard coating agent (1) and (2), respectively, the expression “a” and “b”in the column of “second layer” in Table 1 show the low refractive indexresin compositions (a) and (b), respectively, and the subsequent numeralvalues show the content (% by weight) of the solid content afterdilution.

Furthermore, on the opposite surface to the low reflective layer, anadhesive agent, which is obtained by mixing 100 g of a solvent typeadhesive agent (solid content: 28%) (a trade name PTR-2500T, produced byNippon Kayaku Co., Ltd.), 0.3 g of a cross-linking agent L-45 (a tradename, produced by Nippon Kayaku Co., Ltd.) and coloring agents, 0.767 gof CAB-LX-905-Black, 0.333 g of CAB-LX-716-Blue and 0.307 g ofCAB-LX-471-Red, is coated in such a manner that the film thickness afterdrying is 17 microns, and the visible ray transmittance after drying isabout 60%, so as to obtain electroconductive (antistatic) reflectionpreventing films having a colored adhesive.

The electroconductive reflection preventing films were subjected tovarious examinations. The results are shown in Table 1. The totalluminous transmittance and the haze were examined by using the filmsbefore providing the colored adhesive layer.

TABLE 1 Surface Total Hard High Second resistivity luminous coat Firstrefractive layer Pencil Scratch (Ω per square) Reflectivitytransmittance Example layer layer index layer (%) hardness resistance(×10⁸) (%) (%) Haze 1 — 11 (1) a 15 2H A 1.9 3.83 87.8 1.5 2 — 11 (1) a7  2H A 2.0 2.09 89.2 1.3 3 — 11 (1) a 3  2H A 1.5 4.33 87.6 1.3 4 — 11(1) a 7  2H A 2.1 2.06 87.2 1.4 5 — 11 (2) a 15 2H A 2.0 1.93 88.1 1.0 6— 11 (1) b 7  2H A 1.7 1.39 89.9 1.5 7 — 11 — a 15 2H A 1.6 4.03 89.01.8 8 — 12 — a 7  2H A 0.5 1.4 89.3 0.7 9 41 12 — a 7  3H A 8 1.4 90.10.5

Pencil hardness: Measured according to JIS K5400 (A pencil is attachedto a sample at an angle of 45°, and scratched on the surface under aload of 1 Kg, so as to obtain a pencil hardness that does not form aflaw.)

Scratch resistance: Rubbing is conducted using steel wool #0000 under aload of 200g/cm² 20 times, and the damage on the surface was observedvisually.

A: Very good

B: Good

C: Slightly poor

D: Poor

Surface resistivity: Measured with a surface resistivity measuringapparatus (Megaresta produced by Shishido Static Electricity, Co., Ltd.)

Reflectivity: Reflectivity (%) at a wavelength of 550 nm

Total luminous transmittance and haze: Measured with a haze meter,TC-H3DPK of Tokyo Denshoku Co., Ltd.)

Example 10

2 Parts of Solsperse 20000 (a dispersant, produced by ZenecaAgrochemicals, Co., Ltd.) and 38 parts of MEK are added to 100 parts ofCelnax CX-Z650M-3F (a methanol sol of zinc antimonate, solid content:60%, produced by Nissan Chemical Industries, Ltd.), and 40 parts of anultraviolet ray-curable resin composition (A), which is obtained bymixing ultraviolet ray-curable resins as a binder, 51.6 parts of KAYARADDPHA (dipentaerythritol hexaacrylate, produced by Nippon Kayaku Co.,Ltd.) and 12.9 parts of KAYARAD PET-30 (pentaerythritol triacrylate,produced by Nippon Kayaku Co., Ltd.), 5.5 parts of Irgacure 184 (aphotopolymerization initiator, produced by Ciba Geigy Ltd.) and 30 partsof toluene, is further added thereto, followed by sufficiently stirring,so as to obtain an antistatic high refractive index hard coating agent(3).

Example 11

2 Parts of Solsperse 20000 (a dispersant, produced by ZenecaAgrochemicals, Co., Ltd.) and 32 parts of MEK are added to 100 parts ofCelnax CX-Z650M-3F (a methanol sol of zinc antimonate, solid content:60%, produced by Nissan Chemical Industries, Ltd.), and 25 parts of anultraviolet ray-curable resin composition (B), which is obtained bymixing 64.5 parts of an ultraviolet ray-curable resin, KAYARAD DPHA(dipentaerythritol hexaacrylate, produced by Nippon Kayaku Co., Ltd.),Irgacure 184 (a photopolymerization initiator, produced by Ciba GeigyLtd.) and 30 parts of toluene, is further added thereto, followed bysufficiently stirring, so as to obtain an antistatic high refractiveindex hard coating agent (4).

Example 12

An antistatic high refractive index hard coating agent (5) is obtainedin the same manner as in Example 11 except that the methanol sol of zincantimonate is Celnax CX-Z600M-3F2 produced by Nissan ChemicalIndustries, Ltd.

The compositions of Examples 10 to 12 (antistatic high refractive indexhard coating agents (3) to (5)) were coated on a polyester film of 188μm (A4300 produced by Toyobo Co., Ltd.) by using a coating rod at a filmthickness of 1 μm, followed by irradiating with an ultraviolet ray, soas to provide cured films, and measurements for total luminoustransmittance, haze, pencil hardness, scratch resistance and solventresistance are conducted. They are coated on glass using a coating rodto a film thickness of 1 μm, followed by irradiating with an ultravioletray, so as to provide cured films, and the refractive indexes of thecured films of the respective compositions are measured by themeasurements of the refractive index at 550 nm.

TABLE 2 Total luminous Surface transmittance Pencil Scratch SolventRefractive resistivity Example (%) Haze Hardness resistance resistanceindex Ω per square 10 83.7 1.0 2H A A 1.595 3 × 10⁷ 11 83.0 1.0 2H A A1.617 1 × 10⁷ 12 85.2 0.9 2H A A 1.616 1 × 10⁷

Note) Test Methods

Total luminous transmittance and haze: Measured with a haze meter,TC-H3DPK of Tokyo Denshoku Co., Ltd.)

Pencil hardness: Measured according to JIS K5400 in the similar mannerabove

Scratch resistance: Rubbing is conducted using steel wool #0000 under aload of 200g/cm² 20 times, and the damage on the surface was observedvisually.

A: Good

B: Slightly poor

C: Poor

Solvent resistance: Rubbing is conducted with MEK 20 times, and theconditions of the coated film were observed.

A: Good

B: Slightly poor

C: Poor

Refractive index: Measured with Abbe's refractometer

Surface resistivity: Measured with a surface resistivity measuringapparatus, Megaresta produced by Shishido Static Electricity, Co., Ltd.

INDUSTRIAL APPLICABILITY

The transparent sheet or film of the present invention is good inproductivity, high in transparency, excellent in antistatic property andreflection preventing property, high in hardness, and excellent inscratch resistance and solvent resistance, and therefore, forimprovement in protection and/or viewing of picture in display andpolarizing plates and a surface of various plastics or glass, it can beconveniently applied to the surfaces thereof.

What is claimed is:
 1. A transparent resin sheet or film having on onesurface of a transparent support, a first electroconductive transparentlayer having a refractive index of 1.55 or higher and comprising a curedlayer of an ultraviolet ray-curable (meth)acrylate resin having two ormore (meth) acryloyl groups in a molecule thereof and containing fineparticles of electroconductive zinc antimonate anhydride having aprimary particle diameter of 0.5 microns or less in an amount of from 55to 90% by weight based on the total weight of the firstelectroconductive transparent layer, and a second transparent resinlayer having a refractive index of 1.5 or less and being formed on thefirst layer, and the surface reflectivity of said transparent sheet orfilm is 4% or less at 550 nm of wavelength.
 2. A transparent sheet orfilm as described in claim 1, wherein the first electroconductivetransparent layer contains a dispersant.
 3. A transparent sheet or filmas described in claim 1 or 2, wherein said fine particles are zincantimonate having a particle diameter, by a BET method, of 18 nm or lessand an average particle diameter, by a dynamic light scattering method,of 100 nm or less.
 4. A transparent sheet or film as described in anyone of claims 1 or 2, wherein the second transparent layer contains asurface active agent.
 5. A transparent sheet or film as described in anyone of claims 1 or 2, wherein the second transparent layer has arefractive index of 1.48 or less.
 6. A transparent sheet or film asdescribed in any one of claims 1 or 2, which has a hard coated layercomprising an ultraviolet ray-curable (meth)acrylate resin having two ormore (meth)acryloyl groups in a molecule thereof, between thetransparent support and the first layer.
 7. A transparent sheet or filmas described in claim 6, characterized that the transparent sheet orfilm has a hard coated layer formed between said transparent support andsaid first layer, and wherein said transparent sheet has fine unevennesson the surface, facing the first layer, of said hard coated layer, saidhard coated layer being made from said ultraviolet ray-curable(meth)acrylate resin.
 8. A transparent sheet or film as described in anyone of claims 1 or 2, which has a transparent layer comprising anultraviolet ray-curable transparent hard coating agent and having arefractive index higher than that of the first layer between the firstlayer and the second layer.
 9. A transparent sheet or film as describedin claim 8, characterized that the transparent sheet or film has a hardcoated layer formed between said first layer and said second layer, andwherein said hard coated layer has fine unevenness on the surface,facing said second layer.
 10. A transparent sheet or film as describedin claim 8, wherein said ultraviolet ray-curable transparent hardcoating agent of a high refractive index comprises an ultravioletray-curable binder containing an ultraviolet ray-curable resin havingtwo or more (meth)acryloyl groups in a molecule thereof, and fineparticles of a high refractive index comprising a metal or a metallicoxide; and said transparent layer comprising said transparent hardcoating agent has a refractive index of 1.55 or higher.
 11. Atransparent sheet or film as described in claim 10, wherein the fineparticles of a high refractive index are zirconium oxide, titaniumoxide, cerium oxide, zinc oxide, indium oxide or a three-component solof titanium oxide, zirconium oxide and tin oxide, and have an averageparticle diameter of 0.5 μm or less.
 12. A transparent sheet or film asdescribed in claim 1, which has an adhesive agent layer on the othersurface of the transparent support.
 13. A transparent sheet or film asdescribed in claim 12, wherein the adhesive agent is colored by acoloring agent.
 14. A transparent sheet or film as described in claim13, wherein the coloring agent is a pigment.
 15. A transparent sheet orfilm which comprises a transparent support having, on one surface ofsaid transparent support, a hard coating layer of an ultravioletray-curable (meth)acrylate resin having two or more (meth)acryloylgroups in a molecule thereof, and a first electroconductive transparentresin layer formed on the hard coating layer and comprising a curedresin layer and particles of electroconductive zinc antimonate anhydridebeing formed thereon, and a second transparent resin layer being formedon the first electroconductive transparent layer wherein the refractiveindex of said second transparent resin layer is lower than that of thefirst layer, and wherein the fine particles of zinc antimonate are zincantimonate having a particle diameter, by a BET method, of 18 nm or lessand an average particle diameter, by a dynamic light scattering method,of 100 nm or less and wherein said resin of the first resin layercomprises an ultraviolet ray-curable (meth)acrylate having two or more(meth)acryloyl groups in a molecule thereof and the amount of theelectroconductive zinc antimonate anhydride is from 55 to 90% by weightand having a haze of 1.5 or less and a reflectivity of 2% or less.
 16. Adisplay device on which a transparent sheet or film as described inclaim 15 is attached.